Pipe-mold.



J. c. KNAPP, JR. PIPE MOLD APPLICATION FILED MAR.22,1909,

Patented MELT. 7, 19M.

ya/Z725 30 drawn' from thelnaterial or partially com- UNITED STATES PIPE-MOLD.

To all whom it may concern:

' Be it known that I, JOHN C. KNAPP, Jr.', a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a new and useful Pipe-Mold, of which the following is a specification.

It is the object of the present invention to provide a simple and durable culvert mold which will be capable of withstanding a maximum degree of pressure and which may be readily removed when the material which is packed around it has become hardened.

. It is customary, in most instances, to pro-' vide a culvert mold of thisclass in which the wall of the-mold is comprised of but a single sheet of metal bent into substantially cylindrical form and with its opposite longitudinal edges overlapped. It has been found however, by practical experience, that a mold of this construction is frequently difficult to remove from the mass of'material owing to the fact that all portions of its walls are not simultaneously adjusted to the same degree.

g It is therefore the object of the present invention to provide a mold of the class so ccolnstructed that after the material, packed around the mold, has hardened, it may be readily collapsed orcjbntracted and withi pleted culvert.

In the accompanying drawings, Figure 1 1s a vertical longitudinal sectional view of a.

mold constructed in accordance with the present invention. Fig, .2 is a Vertical trans line 2-2 of Fig. 1, and, Fig. 3 is a detail view artly in elevation and partly in section-slowing the manner of supporting the mold section from the adjusting rod or shaft of the mold.

As heretofore stated, the mold embodying the present invention is made up of a plu rality of arcuate sections and while, in the drawings, these sections are shown'as four in number, it will be understood that any desired number may be employed;

Each of the sections extends through an arc of substantially 90 and consists of a sheet metal plate 5 rolled or curved to the degree stated and held yieldably in this shape or positionthrough the medium of ribs which are secured upon its inner surface and which extend from one longitudinal edge to the other thereof Each of the PATENT OFFICE.

JOHN C. KNAPP, JR., OF PHILADELPHIA, PENNSYLVANIA.

Specification of Letters Patent. Application filed March 22, 1909. Serial No. 485,069.

Patented Mar. 7, 19 1 ribs just mentioned embodies a wing 6 through which and the said plate '5; are

passed suitable securing devices 7 for the purpose of securing the rib in position upon the said plate, and a rib 8 which extends inwardly radially at right angles from the rib 6 and serves as a means for the attachment of suitableadjusting and supporting devices which will presently be fully descrlbed.

As shown in Fig. 2 of the drawings, each of the upper of the plate 5, indicated more specifically by the numeral 5", has its edge portions ofl'set as at 9 to-atford side flangesand in assembling this section with the two side sections of the mold, indicated each specifically by the reference character 5', these flanges 9-01" ofiset edge portions overlap the upper edge portions of said sides, as clearly shown in the said Fig. 2 of the drawing. Similarly, the lower edge portions of the side sections 5* are offset, as at 10 and overlap the side edges of the bottom section of the mold, indicated specifically by the reference character 5, it being understood that all of the sections when assembled in the manner stated, afi'ord'a cylindrical core, the outer surface of which is practically unbroken and smooth.

As clearly shown in Fig. 2 of the draw ings, there are formed or secured at both ends of the several flanges 8 of the section 5, extensions 11 which overlap the opposed ends of the corresponding fianges of the sections 5 and these sections 5 are provide-l also at their lower ends with similar exten sions 12 which overlap the extremities of the corresponding flanges 8 of the bottom section 53 of the mold, it being understood that by this means, relative longitudinal. movement of the mold section is effectually obvi ated. Furthermore, in this connection, it will be observed upon inspection of Fig. l of the drawings that the flanges or ribs of the mold section on one sidool the middle of the mold havetheir flanges 6 presented in one direction whereas, the corresponding flanges to the other side of the middle of the mold are presented in the opposite direction. so; that relative longitudinal movement in either direction is prevented.

A block 13 is disposed within the angle between the flanges G and 8 of each of the mold sections and these blocks are so osi tioned that theones upon the upper mold section 5 will be located at a point diametrijally; opposite to the ones upon. the lower heads provia' ture and throng] I in" mic-claims 17 formed in spam: 1r 1!? at the outer end of an arm 19, manner being; p2 s t-id blocks aid flanges 6. l

A head 24., to lie pres ni,,ly more Cally described, is ii. 1r 22 through which lliit'l )in 20, the inns in this connected with the Isl conscqu en =neci i .a with pain, of lugs 21. the inner ends of the arms: .aPZlSQ pivot pine 23.

t will be UHFiGLEtCKJd 1 om the foregoing,

description of the invention that one of time f to? each i of the urine 1.9 and through each. oi the heads there is formed, axially, eded 235' through which passes an in: having right and left tin. icli eytend from apoint mid-Way be 1 of the rod to the said ends It will be understoo. tion of the rod in r i seat or adjust. we heads other and that rotation rection will serve to i each other upon ti;

t rote; tion will serve to 24; away iron; each in the opposite dithe heads toward 10 in order that saidrotz'ition o, L- I be readily flanges of the ribs serving as a means for v. accomplished til cm-ided at one end ii nmng the movement of the of the rod. e ii u From the forego ng cle' u'ip'tion oi the in.-- vention, it will. be s: u. the: when the adjust"- ing rod 26 is rotated as to adj net the heads toward. each other, the outer ends or extremities of the arm. ii are bowed inwardly and carry with them re sections 5", 5, and 5 of the mold, thereby contracting the mold and I will be fully expanded, further moveme permitting of its removal from the hardened Dfiltllfil'lill of the partly completed culvert. ()1) the other hand, when the mold is to be se tip for use, its sections are expanded by adjusting the heads away from each other 21nd the mold is then disposed upon any suit able bed or foundation and the materia which is to constitute the culvert is sui ably packed about the mold and allowed ii. :1 rd en I it will be observed from inspection of Fi of the drawings, that the inner. end of oi the arms 19 is partly squared, as indiYG Oatd by tllfi numeral 28 so that'w hcn the aim llLE-i been adjusted to a position direct/1y mdiellv Witli'i'cspcct to the adjusting rodjfi; in which position the sections of the the arm cannot be accomplished except, direction to contract the sections of mold.

VVl'iet is claimed is:-- A mold comprising a plurality of arcuate sect-ions, flanged ribs upon the inner sides of arranged-- exitheeections, an adjusting rod ally of the mold, a head mounted u" oil-the adjusting rod, arms pivoted-to tl'i bloc 3 having threaded studs I through the flanges of the ribs, nuts:

ed upon the studs, the arms being ptheir outer ends to the blocks, the a; po ing the sections for adjust-men respect to the rod, and men." by the ribs oi? certain of the Secti' ge s ng; with the ribs of certain 0 or of the sec one whereby to hold the secti s against relative longitudinal displocemeu the Said dire'otion.

l testimony that I'Olililll fr, egoing as my own, I have hereto :iflixed jmy signature in the presence of two Witnesses;

JOHN o Kemp, JR. -Wit-neeses:

AME IA. Fl WAGNER,

Auous'r WAGNER. 

